There's some confusion about the NDA, but as far as I can see... The Company didn't disclose to anyone.
It broke down in due diligence which could just mean that The Company looked at their financials, and found that they were a lot weaker than first presumed and thus not a good acquisition. I'm not sure they admitted that they weren't profitable (who does really?), so it might have been presumed that if you have X products, and Y infrastructure then you must have Z sales behind it. When they looked at the financials, they didn't see the sales figure they wanted so bailed.
As part of due diligence, they want to know what the secret recipe is. After all, you'd hate to find out one of the special herbs and spices is cocaine or arsenic. This is fine because MegaCorp signed an NDA.
MegaCorp breaks off the deal. Their chefs decide that they can make their own chicken. After all it's not hard to combine these nine herbs and spices.
The chefs only have this knowledge because you revealed your trade secrets under the protection of an NDA. They're not white box reverse engineering the recipe.